Electric-arc lamp



3 Sheets-Sheet 1.

(ModeL) E. A. EDWARDS.

ELECTRIC ARC LAMP.

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Patented Apr. 3, 1883.

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Q 3 Sheets-Sheet 2.

E. A. EDWARDS.

ELECTRIC ARC LAMP.

(Model*.) I

No. 275,172. Patented Apr. 8, 1883.

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(ModeL) 3 Sheets-Sheet 3.

E. A. EDWARDS.

ELECTRIC ARC LAMP.

N0..2'75,172. Patented Apr. 3, 1883.

UNITED STATES PATENT OFFICE.

EDGAR A. ED\VARDS, OF CINCINNATI, ASSIGNOR TO 0. M. GOTTSOHALL, TtUSTEE, OF DAYTON, OHIO.

ELECTRlC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 275,172, dated April 3,1883.

Application filed October 17, (Modem To all whom it may concern Be itknown that I, EDGAR A. EDWARDS, a citizen of the United States, and aresident of Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in Electric Lights, ofwhich the following is a specification.

My invention relates to an improvement in electric-light regulators, ormechanism for adjustiug the carbons in an electric light of thevoltaic-arc type.

The features of my invention will be set forth in the description of theaccompanying drawings, of which-- Figure 1 is a broken perspectiveelevation. Fig. 2 is a side elevation of the lamp with one side of thecase removed, showing the regulating mechanism. Fig. 3 is a section online mm, Fig. 2; Fig. 4, a crosssection, line 3; 3

Fig. 2. Fig. 5 is a detail view of the uppercarbon-rod holder andcentering device. Fig. 6 is a section on line :20 m, Fig. 5; Figs. 7 and8, detail views of the clutch; Fig. 9, thelower yoke; and Fig. 1.0 showsa tension-spring for regulating the movement of the armature;

Fig. 11, front elevation of lifting-arm.

A represents the cast-metal case containing and protecting the operativemechanism; B, t'he'helices of the principal magnet.

0 C C are the fine-wire helices ot' the shuntmagnet; D D, maximum polaryokes uniting the two cores of the magnets P P. These yokes are of softiron, and are polar extensions and points of maximum polarity having anup- 5 wardly-projectiug lug, D.

E is a vibrating pendulous armature, suspended by a thin spring, 6,secured to polar yoke D.

d d are soft-iron lugs, secured to yoke D in 40 such a manner as tomagnetically charge the upper end of armature E, which is pivoted at thetop in close proximity to the polar extension D, while the lower endswings in close proximity to the polar extension D, so as to 5 divertsufficient magnetism from the closed magnetic circuit to operate thearmature, and through it the clutch mechanism.

F is a metal arm, secured to the upper end of armature E in such amanner that its outer 0 end shall rise or fall with the vibrations ofarmature E.

f is a piece of metal secured rigidly to end of arm F, and to whichspring iis attached.

G represents a connecting-rod attached to the end of arm F by springf,and having slot g, which engages the end of the clutch-lever I also, an(3Xi8l1Si0ll,[/', which acts as a plungerrod in dash-pot H.

I is a clutch, made by securing the two ends of a coiled or twistedmetal spring to arm 1. This spring is made of peinlulum-spring steel, soas to yield and grasp the entire circumference of the rod, and forms asensitive clutch.

J represents the 'ertically-mm'ing carbonrod, having upper bearing, K,and lower bear- 6 ing, K.

L represents a fixed perforated plug, secured to the inside of the lowerend of the verticallymovingcarbon-rod J, having rigidly secured to itthe upper end of a flexible steel rod, 1, to the lower end of which issecured the carbonclamp M.

N represents a metal collar tapping into the lower end of carbon-rod J,and having ccntering set-screws 12, whose points bear against the shankof clamp M.

P P represent the stationary cores of the magnets.

The operation of the mechanism is effected differentially by thecombined action of the coarse-wire magnet B B, which'carries theprincipal amount of current supporting the arc, and the fine-wire magnetG O, which is connected in shunt so as to form a by-path for a small percent.ofthe current-aconnectiou well known in the art. The helices of themain magnet B B and shunt-magnet 0 G are wound in such manner that theyare caused to induce opposite polarities in the same polar yoke ormagnet- -tha-t is to say, the main magnet B B will induce north polarityin the upper and south polarity in the lower polar yoke, while theshunt-magnet O C will induce south polarity in the upper and northpolarity in the lower polar yoke. The position of the parts 5 as shownin the drawings represents the lamp before the current is turned on.When the current is sent through the lamp the magnetism made by theprincipal helices charges the yokes D D, which in turn charge armatureE, the lower end of which moves toward lug D, thus causing the end ofarm F to move vertically upward, carrying connecting-rod G, with itsloop, which elevates the end of arm I, causing the clutch to grasp thecarbon-rod J and raise it, thus making the initial carbon separation.The increase of the length of the are by the disintegration of thecarbons shunts a larger proportion of current through the finewirehelices, thus increasing their magnetism, which-acts to neutralize themagnetism of the principal helices B B, thus decreasing the magneticattraction between lug D and arm ature E, which then moves away from lugI), thus lowering the clutch mechanism until the end 1" of arm I comesin contact with its rest, and when the clutch is tripped and rod Jslides downward, when the same movement is repeated.

The object of the device shown in Figs. 5 and 6 is to provide suitablemechanism for securing the carbons axially. The slender steel rod lactsas a universal joint, which is centered by means of thumb-screws 91.

It is obvious that in place of the springs c f pivots or other suitablemechanical connec tions may be used.

The clutch I is made of thin spirally-twisted spriiig'steel, with upperand lower projecting twists, i t', which yieldingly holds the carbonrodJ in a vertical position, and an extremely sensitive clutch, and is onefeature of my invention herein described.

The pendulous armature I have found to be very sensitive, and theoperation of the adj ustingmeclmnism materially benelitted by its use.

I do not claim a helical frictionclamp surrounding the carbon-holder,and the friction of which is varied by endwise movement.

I claim- 1. In an electric lamp, the combination of two differentialmagnets united at either end by maximum polar yokes, with a pendulousarmature pivoted to one of said yokes, and a polar extension on theother yoke, which is projected to be in close proximity to the free endof the pendnlous armature, substantially as and for the purposedescribed.

2. An electric lamp having a principal and ashunteleetro-magnet, theaxial cores ofwhich are vertical and united by yokes at either end, oneof which yokes is provided with a maximum polar piece, 1), for operatinga pendulous armature pivoted to one of said yokes to adjust the carbons,substantially as herein set forth.

3. In an electric lamp, the adjusting mechanism composed ofpendulousarmature E, arm I rigidly attached to the pivoted end of arm ature E,connecting link rod G, arm I, and clutch I, in combination withcarbon-rod J. substantially as herein set forth.

at. In combination with the carbon'rod J, the flexible supporting-rod l,centering devices N a, and clamp M, substantially as herein set forth. I

5. In combination with armature and arm F, the connecting link rod G,extended to form the dash-pot plunger-rod, substantially as herein setforth.

6. The combination, with the carboncarrier, of a spring-clamp composedof a convoluted plate of metal through which the carbon-carrier passes,substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

EDGAR A. El) WAR-D8.

Witnesses:

JNo. E, Jones, ADOLPH GLUCHOWSKY.

